You can change a discount code using the following steps:
1. Go to the main menu and select "Settings", then you click on "Discount codes".
2. Click on the discount code you want to change.
3. Adjust the desired specifications for your discount code.
4. Please note when changing the name of the discount code that the deeplink url will also change! (regarding iframes).
When you're done changing, you can press the blue button "Add discount code".